Content for TR 26.931 Word version: 18.0.0
2 References
3 Definitions and abbreviations
4 Release 11 "For Further Study" Items
5 New Acoustic Tests
6 Conclusions
$ Change history
2 References p. 6
3 Definitions and abbreviations p. 8
3.1 Definitions p. 8
3.2 Abbreviations p. 8
4 Release 11 "For Further Study" Items p. 8
4.1 Stability loss, Headset UE p. 8
4.2 UE Delay, NB & WB Wireless Headset p. 8
4.3 NB & WB Echo control ("double-talk") characteristics p. 8
4.3.1 Results from a study on NB Echo control ("double-talk") characteristics using P.835 methodology p. 8
4.3.1.1 Background p. 8
4.3.1.2 Test Method & Results p. 8
4.3.1.2.1 Methods p. 8
4.3.1.2.2 Results p. 12
4.3.2 Comparison of predictions from objective metrics to subjective double talk ratings p. 17
4.3.2.1 Background and metrics p. 17
4.3.2.2 Comparison of metrics to subjective SIG ratings p. 17
4.3.2.3 Comparison of metrics to subjective BAK ratings p. 24
4.3.2.4 Comparison of metrics to subjective OVRL ratings p. 25
4.3.2.5 Summary of comparison of metrics to subjective ratings for double-talk p. 26
4.4 Free-field measurements for vehicle-mounted hands-free p. 27
4.5 Idle Channel Noise, Sending/Receiving of test signal p. 27
5 New Acoustic Tests p. 27
5.1 Time-variant user behaviour p. 27
5.2 Additional UE usage environments p. 27
5.3 Results from a study on positional robustness tests and background noise simulations p. 27
5.3.1 General p. 27
5.3.2 Setup p. 28
5.3.3 Measurement Results p. 31
5.3.4 Summary p. 35
5.4 Results from a study on objective measures with noise suppression and background noise p. 35
5.4.1 Comparison of P.862 to subjective results for noise suppression p. 35
5.4.2 Experiment 1 - NB P.835 versus P.862.1 p. 36
5.4.2.1 Setup p. 36
5.4.2.2 Results p. 36
5.4.3 Experiment 2 - Problems with tuning for P.862.1 p. 38
5.4.3.1 Setup p. 38
5.4.3.2 Results p. 38
5.4.4 Experiment 3: WB P.835 v P.862.2, P.863 and TS 103 106 p. 39
5.4.5 Experiment 4 SWB P.835 v P.862.2, P.863 and TS 103 106 p. 42
5.4.6 Conclusions p. 45
5.5 Validation results for combination of model A and B according to ETSI TS 103 281 p. 46
5.5.1 Introduction p. 46
5.5.2 Description of combination of model predictions p. 46
5.5.3 Validation database 3 (DES-25): Results for combined model p. 47
5.5.4 Validation database 4 (DES-26): Results for combined model p. 49
5.5.5 Validation database 5 (DES-27): Results for combined model p. 51
5.5.6 Conclusions p. 53
6 Conclusions p. 53
$ Change history p. 54
